This physiological system is helpful for obtaining food and oxygen.

• A. Excretory
• B. Muscular
• C. Reproductive
• D. Digestive

Answer: (B)

Movement and breathing hinge on the muscular system. Muscles provide the force for locomotion, which lets an organism search for and capture food. They also power breathing: the diaphragm and rib muscles expand and contract the chest cavity to draw in air, delivering oxygen to the body. In addition, muscles help move food through the digestive tract (peristalsis) and chew or swallow, supporting food intake.

The excretory system focuses on waste removal, not on obtaining food or oxygen. The digestive system handles breaking down food and absorbing nutrients, but it doesn’t drive the actual intake of oxygen. The reproductive system is about creating offspring. So, the muscular system is the best fit because it directly enables both finding food and taking in oxygen through movement and respiration.